Oracle DB Error ORA-00998 must name this expression with a column alias

The following in the cause of this error:

An expression or function was used in a CREATE VIEW statement, but no corresponding column name was specified. When expressions or functions are used in a view, all column names for the view must be explicitly specified in the CREATE VIEW statement.

Action you can take to resolve this issue: Enter a column name for each column in the view in parentheses after the view name.

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